Method and apparatus for processing of auxiliary media streams embedded in a MPEGH 3D audio stream

ABSTRACT

The disclosure relates to methods, apparatus and systems for side load processing of packetized media streams. In an embodiment, the apparatus comprises: a receiver for receiving a bitstream, and a splitter for identifying a packet type in the bitstream and splitting, based on the identification of a value of the packet type in the bit stream into a main stream and an auxiliary stream.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is continuation of U.S. Ser. No. 16/970,968 filed Aug. 19, 2020, which is 371 US application of PCT/EP2019/054432 filed Feb. 22, 2019, which claims priority of

-   U.S. provisional application 62/634,136 filed Feb. 22, 2018, -   U.S. provisional application 62/641,098 filed Mar. 9, 2018, -   U.S. provisional application 62/697,536 filed Jul. 13, 2018, and -   EP application 18166319.6 filed Apr. 9 2018, which are hereby     incorporated by reference.

TECHNICAL FIELD

The present disclosure relates to providing an apparatus, system and method for packetized media processing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates two exemplary devices.

FIG. 2 illustrates an exemplary MPEG-H 3D audio packet stream in accordance with the present invention.

FIG. 3 illustrates two exemplary devices.

FIG. 4 schematically illustrates an example of a primary decoder/renderer in accordance with the present invention.

FIG. 5 schematically illustrates another example of a primary decoder/renderer in accordance with the present invention.

FIG. 6 illustrates exemplary packet types.

DETAILED DESCRIPTION

For home Consumer Electronics (CE) installations, functionality can be spread over several devices (e.g., set-top boxes, TV-sets, AVR-receivers), where such devices are connected via standardized interfaces (e.g. HDMI).

A first device can receive media streams from broadcast and/or broadband connections. That first device can additionally have sophisticated intelligence (e.g. “smart speaker” functionality). A second device can be dedicated to media decoding, rendering and presentation to users.

Typically, a media program is received by device #1 and sent to device #2 for reproduction. This media program may be known as the “Main program”. From time to time or in addition, a different media program (like an advertisement) received from a different transmission channel or media generated by the “Smart device” capability in device #1,both generally represented in a different media format, shall be inserted or overlaid into the main media program.

This can be accomplished by decoding both the main and the auxiliary program into a generalized, typically uncompressed representation, switching the streams or mixing/rendering both into a combined representation and re-encoding the generated media stream into an encoded transmission format. This method can be performed in any device, such as all performed in device #1.However, high computational power may be required while the rendering stages and the intermediate representation may not provide optimal matching of the actual reproduction system in device #2.

FIG. 1 illustrates an exemplary device #1 and an exemplary device #2.Device #1 may include a primary receiver 101, a secondary receiver/local engine 103 and a packetized stream merger 102. The packetized stream merger 102 may merge data streams received from the primary receiver 101 (e.g., the main stream) and from the secondary receiver/local engine 103 (e.g., the auxiliary data stream). The device #2 may include a stream splitter 201, a primary decoder/renderer 202 and a secondary decoder/renderer 203. The stream splitter 201 may split streams such as a main stream (that may be provided then to a primary decoder/renderer 202) and an auxiliary stream (that may then be provided to the secondary decoder/renderer 203). Both decoder output signals may be presented to the listener simultaneously.

To overcome the limitation described above, device #1 can directly send the incoming main media stream to device #2.This mode of device #1 can be called “pass-through” mode. However, the downside of this approach is that standardized interfaces are only specified to convey one single data stream for video and audio, and therefore the second media stream can't be sent natively over the interface to device #2 for reproduction.

The present invention may provide for methods and apparatus for a first receiver for receiving packetized media data, a secondary receiver for receiving an additional media stream and a transmitter interface for sending packetized media data.

This invention proposes to merge the second auxiliary media stream into the packetized main media stream by the following means.

Media streams represented as packetized streams typically use packet type identifiers to differentiate multiple sub-streams with the overall media stream. To convey additional (media) data not related to the main media stream, the first device #1 can encapsulate the additional data in packets formatted according to the main media stream but labeled by a dedicated tag in the packet header. This dedicated tag will trigger the receiving device #2 to strip out the packets carrying the additional media stream. Optionally, device #2 may then provide the additional media stream to a secondary decoder/renderer 203 instance while the main stream simultaneously being received by the primary decoder/renderer 202.

In one example, legacy receiving devices that do not recognize this new tag in the packet header for additional encapsulated media streams are already expected to disregard those packets.

The tag may be provided in any encoded audio data stream environment, such as MPEG-H, AC-4, Dolby Digital+, etc.

If additional inserted data streams exceed a substantial data rate compared to the original media stream, a receiver device should filter the incoming packetized stream and optionally strip out the additional data packets to maintain the receiver buffer model of the downstream connected (legacy) media decoder.

Further, FIG. 3 illustrates an exemplary device #1 and an exemplary device #3.Device #1 may include a primary receiver 101, a secondary receiver/local engine 103 and a packetized stream merger 102. The packetized stream merger 102 may merge data streams received from the primary receiver 101 (e.g., the main stream) and from the secondary receiver/local engine 103 (e.g., the auxiliary data stream). The device #3 may only include a primary decoder/renderer 301, but not a stream splitter. In one example, it might not be possible to provide an auxiliary stream to a secondary decoder/renderer. In this example, a modified primary decoder might decode/convert/mix an auxiliary stream with the main stream internally.

MPEG-H Ecosystem

MPEG-H 3d Audio according to ISO/IEC 23008-3 is encapsulated in a MHAS format. This format utilized a packetized format where each packet consists of a packet header and a packet payload. While the payload can be any binary data, the header specifies the type and the length of the payload. (The additionally available label can be used differentiate multiple instances, but is not utilized here.)

By assigning a new MHAS packet type for the secondary media stream (exemplatorily named PACTYP_MEDIA), additional audio data represented either as uncompressed PCM data, optionally further specified using the RIFF/WAV format, or compressed audio data such as MPEG-4 audio according to ISO/IEC 14496-3 or any other encoded representation (e.g. according to ATSC A/52 or ETSI TS 103 190) can be encapsulated into MHAS packets and thus can be merged into the main MPEG-H 3d Audio stream. The different formats to be encapsulated can be differentiated by either different packet types (e.g. PACTYP_PCM, PACTYP_MPEG4AUDIO, . . . ) or, as show in the example below, by an additional specifier forming a sub-header of the MHAS packet.

Since (media) data may require configuration data but may not be represented as self-contained streams, this data may be encapsulated in the header of the container MHAS packet, or an additional MHAS packet (e.g. PACTYP_MEDIA_CONFIG or another type of MHAS packet name indicating configuration, such as PACTYP_PCMCONFIG) may be assigned, which, in addition, may also carry the information on the type of the additional data. The MHAS packet type may carry configuration information for PCM payload data for feeding the configuration information to the decoder. For example, if an MHAS packet type for configuration information (e.g., PACTYP_MEDIA_CONFIG or PACTYP_PCMCONFIG) is present in the bitstream (e.g., after PACTYP_MEDIA_CONFIG), PCT data configuration information in the form of a data structure (e.g., pcmDataConfig( )) may be fed to a decoder.

In general, an MHAS packet type (e.g., PACTYP_PCMDATA) may be used to embed PCM payload data corresponding to PCM signals defined in the configuration structure and to feed PCM data in the form of a PCM data payload structure to the decoder. If the MHAS packet type (e.g., PACTYP_PCMDATA) is present in the bitstream, the PCM data payload structure (e.g., pcmDataPayload( )) may be used during decoding.

FIG. 2 illustrates an exemplary MPEG-H 3D audio packet stream in accordance with the present invention.

In one example, the present invention may be based on identifying information based on the following syntax amendments:

-   -   1) Amend table 220—Syntax of MHASPacketPayload( ) with:

No. of Mne- Syntax bits monic MHASPacketPayload(MHASPacketType) {    switch (MHASPacketType) {       ...       case PACTYP_MEDIA:         mhasMediaDataType; 8 uimsbf         For (i=0; i< MHAS-         PacketLength; i++) {            mhas_media_ 8 bslbf            data_byte[i];         }       ...    }    ... }

-   -   2) Assign an appropriate MHASPacketType for PACTYP_MEDIA in         table 223. Alternatively, the value of MHASPacketType may be         vary or may depend on a preset value, e.g., a value that is         published by a standards organization in the final standards         document.     -   3) The following media type should be specified using the         mhasMediaDataType enumeration:

Value of Format used for mhasMediaDataType mhas_media_data_byte 0 RIFF/WAV 1 MPEG-1/2 as specified in ISO/IEC Layer1, 2, 3 11172-3, ISO/IEC 13818-3 2 MPEG-4 AudioMuxElement(1); Audio as specified in ISO/IEC in LATM 14496-3 3 Dolby Digital, as specified in ETSI Dolby Digital TS 102 366 Plus 4 MPEG-2/4 as specified in ISO/IEC AAC in ADTS 13818-7, ISO/IEC 14496-3 5 Dolby AC-4 as specified in ETSI TS 103 190 6 Text-to-speech As used for TTS engines as examplatory constrained in IEC 62731 7-255 reserved

FIG. 2 exemplarily shows a packetized main stream including exemplary packets according to MPEG-H 3D audio with 3D audio data (exemplarily including configuration data e.g. PACTYP_MPEGH3DACFG, as metadata, and coded audio data, e.g. PACTYP_MPEGH3DAFRAME).

Furthermore, FIG. 2 exemplarily shows a packetized secondary stream (auxiliary stream) including exemplary packets in accordance with the invention, as being indicated by header information referring to the above-described exemplary additional packet type PACTYP_MEDIA including additional audio data (auxiliary audio data/secondary audio data), exemplarily in compressed format, e.g. MPEG4Audio.

Alternatively or additionally, the additional audio data can be packeted into a packet having the header in accordance with the format of the packetized main stream, here exemplarily MPEG-H 3D audio, including a sub-header indicative of the different formats encapsulated as discussed above.

In accordance with exemplary aspects of the invention, the main stream and the auxiliary (secondary) stream can be merged by a stream merger, such as e.g. by a packetized stream merger 102.

The outgoing stream (merged stream) includes packets relating to the encoded audio data of the main stream and packets relating to the audio data of the auxiliary stream within a single packetized bitstream of a same format (such as exemplarily MPEG-H 3D audio in FIG. 2 ).

It may be noted that non-modified (legacy) MPEG-H 3D audio decoders may not understand the newly added packet type (e.g. PACTYP_MEDIA) and such non-modified (legacy) MPEG-H 3D audio decoders may ignore or dump packets having the newly added packet type (e.g. PACTYP_MEDIA) indicated in their header. Such non-modified (legacy) MPEG-H 3D audio decoders can still decode the audio data relating to the main stream but would not process the additional auxiliary/secondary audio data.

For decoding and processing the merged stream with main and auxiliary stream, decoder devices can be modified to include a modified decoder enabled to filter and decode/process the packets related to the auxiliary audio data.

FIG. 4 . Schematically illustrates another example of a primary decoder/renderer in accordance with the present invention.

FIG. 4 illustrates how this might be achieved in an MPEG-H 3D Audio decoder, where the media format is PCM data. Exemplarily, the primary decoder/renderer 301 is realized as including an MPEG-H 3D Audio Core Decoder M1 and related rendering units such as object renderer M2, e.g. such as defined according to MPEG-H 3D audio (ISO/IEC 23008-3) standard.

The modified decoder 301 might additionally filter and strip out the MHAS packets having a header indicating the new additional packet type (e.g. PACTYP_MEDIA), and input the packets having the auxiliary audio data to a format conversion unit 301 c 1 and then to a sample rate converter (such as exemplarily the sample rate converter M3 present in the decoder architecture downstream of the MPEG-H 3D Audio Core Decoder M1 as defined according to MPEG-H 3D audio (ISO/IEC 23008-3) standard).

Accordingly, the modified decoder 301 might perform sample rate conversion (e.g. by sample rate converter M3) and format conversion (e.g. by format conversion unit 301 c 1) on the input media data (MHASPacketType==PACTYP_MEDIA) in order to match the media sampling rate and channel layout to the output sampling rate and channel configuration of the decoder. Further, a modified decoder might mix input media data or the sampling-rate-converted input media data with the audio media data that have been created by the MPEG-H 3D Audio Core Decoder M1 in a mixer (such as exemplarily the mixer unit M4 present in the decoder architecture downstream of the MPEG-H 3D Audio Core Decoder M1 as defined according to MPEG-H 3D audio (ISO/IEC 23008-3) standard).

The above example of FIG. 4 exemplarily relates to auxiliary media data including uncompressed media data, such as PCM data or the like. It is to be noted that, if the uncompressed media data, such as PCM data or the like, further includes positional information or is related to corresponding positional metadata, e.g. for 3D audio appliances, the auxiliary data can be further processed by a positional data processing object renderer, such as the object renderer M2 present in the decoder architecture downstream of the MPEG-H 3D Audio Core Decoder M1 as defined according to MPEG-H 3D audio (ISO/IEC 23008-3) standard.

FIG. 5 . Schematically illustrates yet another example of a primary decoder/renderer in accordance with the present invention. Exemplarily, the primary decoder/renderer 301 is realized as including an MPEG-H 3D Audio Core Decoder M1 and related rendering units such as object renderer M2, e.g. such as defined according to MPEG-H 3D audio (ISO/IEC 23008-3) standard.

FIG. 5 exemplarily illustrates how the above might be achieved in an MPEG-H 3D Audio decoder, where the media format is encoded data (such as MPEG-4 Audio). A modified decoder 301 might decode the input media data (MHASPacketType==PACTYP_MEDIA) using an additional decoder 301 c 2 (converter and/or decoder configured to convert and/or decode the auxiliary media data), not necessarily specified within ISO/IEC 23008-3. Further, a modified decoder might mix those decoded media data with the audio media data that have been created by the MPEG-H 3D Audio Core Decoder M1 as defined according to MPEG-H 3D audio (ISO/IEC 23008-3) standard.

Time-alignment of multiple MHAS substream originating from different sources

In exemplary aspects in accordance with the present invention, additional time-alignment units may be provided for time-alignment of the packets of the auxiliary stream, e.g. to provide time-alignment of multiple MHAS substreams originating from different sources.

Per section 14.6 of ISO/IEC 23008-3, MHAS “sub-streams are generated by the same encoder [and therefore] it is presumed that various incoming streams [ . . . ] are completely aligned and have no phase offset”. In this case, alignment of a frame may be accomplished using the MHASPacketLabel number. With the proposed method in this invention, the above constraint can no longer be taken for granted. With different frame durations for different codecs or sampling rates, the time offset of consecutive MHAS packets of the secondary stream that is merged with the MHAS main stream varies over time. In each particular time slot, the timing offset of the secondary stream to the main stream needs to be signaled. For example, in associated packets of the auxiliary stream indicating a packet type relating to metadata associated with media data contained in the payload of packets of the auxiliary stream as shown in FIG. 6 .

FIG. 6 illustrates exemplary packet types for achieving the means of this invention based on MHAS, for example where another MHAS packet type is defined to carry appropriate time offset signaling. To link this signaling to the corresponding stream, the time offset packet needs to have the same MHASPacketLabel number assigned as the MHASPacket of type PACTYP_MEDIA it refers to. From FIG. 6 , it is obvious that a direct one-to-one relation of stream data corresponding to one particular time slot of each stream is not guaranteed, but two or more time slots from one stream may correspond to one time slot from the other stream in a timely manner.

Another option for signaling time offset is to add this time offset to the MHAS packet of type PACTYP_MEDIA itself.

In view of the above, in some exemplary aspects in accordance with the present invention, the conversion and/or decoding unit of the modified primary decoder/renderer 301 of the examples of FIGS. 4 and/or 5 may include a time-alignment unit for time-alignment of the auxiliary stream data with the main stream data, e.g. upstream of the mixer such as mixer unit M4 of the examples of FIGS. 4 and 5 , or also upstream of the sampler (e.g. sample rate converter M3) of the examples of FIGS. 4 and 5 , or also as a part of the secondary decoder/renderer 203 of the example of FIG. 1 .

Control of Mixing of Main and Secondary Audio Streams

Additional data to control the mixing of the secondary (auxiliary) audio stream to the main audio streams may be required. Among other options, this data may include static gains or a dynamic gain sequences, examplatory formed as ISO/IEC 23003-4 DynamicRangeControl data to process the main stream when the secondary audio stream is reproduced. Those data are typically generated by device #1 and may be incorporated into the stream by either separate MHAS packets (e.g. with the identifier PACTYP_MPEGH_MEDIA_CFG), as further addition to the secondary stream header or by any other kind of stream encapsulation.

In view of the above, in some exemplary aspects in accordance with the present invention, the conversion and/or decoding unit of the modified decoder 301 of the examples of FIGS. 4 and/or 5 may include a gain adjustment unit for applying static and/or dynamic gains (e.g. for loudness adjustment), e.g. upstream of the mixer such as mixer unit M4 of the examples of FIGS. 4 and 5 , or also upstream of the sampler (e.g. sample rate converter M3) of the examples of FIGS. 4 and 5 , or also as a part of the secondary decoder/renderer 203 of the example of FIG. 1 .

Dolby Ecosystem

Further, Dolby AC-4 (ETSI TS 103 190) and Dolby Digital and Dolby Digital Plus (ETSI TS 102 366) offer the possibility to carry any binary data in EMDF Payloads, which can be used to carry the same or similar data as defined in the above section (MPEG-H Ecosystem).

For such purposes, the syntax element emdf_info( ) as defined in ETSI TS 103 190 or the syntax element emdf_container( ) as defined in ETSI TS 102 366, Annex H and their underlying elements may be used. In order to do this, one can simply define on or more emdf_payload_id definitions, which can be used in order to identify the binary data which has the same or similar format as described above under PACTYP_MEDIA and/or PACTYP_MPEGH_MEDIA_CFG.

System sound mixing for media streams containing uncompressed/uncoded data may be achieved similar in Dolby AC-4 or Dolby Digital/Dolby Digital Plus as shown in FIG. 4 and FIG. 5 , with the difference that the distinction which signal path to use would not be taken based on the MHASPacketType, but on the emdf_payload_id-value.

Media streams addressed by this invention, both the main stream and the side-data streams may be of the following type:

-   -   Audio streams, both compressed and uncompressed     -   Video streams     -   subtitles

The invention may be also applied to video presenting devices (monitors) where an overlay picture, video or text shall be send in addition to the main (typically compressed video stream) over a standardized interface connection.

REFERENCES

-   US20170223429A1, EP3149955A1 -   ISO/IEC 23008-3: (MPEG-H 3d Audio, 2nd Edition)

Enumerated exemplary embodiments of the disclosure relate to:

-   -   EEE1. A method for audio signal processing, comprising:     -   receiving a merged packetized media bitstream which includes         packets associated with a main stream indicative of main audio         information and packets associated with an side-data stream         indicative of auxiliary audio information, identifying a value         of a packet type in header information of packets of the merged         packetized media bitstream, and splitting the merged packetized         media bitstream, based on the identification of the value of the         packet type in header information of packets of the merged         packetized media bitstream, into the main stream indicative of         main audio information and the side-data stream indicative of         auxiliary audio information.     -   EEE2. The method of EEE1, further comprising:     -   mixing an audio output signal based on an output signal obtained         from the main audio information of the main stream and the         output signal obtained from the auxiliary audio information of         the side-data stream.     -   EEE3. The method of EEE 2, wherein output signals from the main         and auxiliary audio information are output simultaneously to a         listener.     -   EEE4. The method EEE1, further comprising:     -   decoding the main stream by a primary decoder.     -   EEE5. The method of EEE1, further comprising:     -   decoding, when the side-data stream relates to compressed         auxiliary audio information, the side-data stream by a secondary         decoder.     -   EEE6. The method of EEE1, further comprising:     -   converting, when the side-data stream relates to compressed         auxiliary audio information, media data included in packets of         the side-data stream by a converter.     -   EEE7. The method of EEE5 or EEE6, wherein     -   the compressed auxiliary audio information includes MPEG-4 audio         data.     -   EEE8. The method of EEE1, wherein     -   the side-data stream relates to uncompressed auxiliary audio         information.     -   EEE9. The method of EEE8, wherein     -   the uncompressed auxiliary audio information includes PCM data.     -   EEE10. The method of EEE1, wherein     -   the packet type indicates an internal raw format, in particular         a decoder-internal raw format.     -   EEE11. The method of EEE1, further comprising:     -   performing signal processing on the side-data stream.     -   EEE12. The method of EEE11, wherein     -   performing signal processing on the side-data stream is         performed prior to mixing an audio output signal based on an         output signal obtained from the main audio information of the         main stream and the output signal obtained from the auxiliary         audio information of the side-data stream.     -   EEE13. The method of EEE11, wherein     -   performing signal processing on the side-data stream includes         performing gain adjustment.     -   EEE14. The method of EEE13, wherein     -   gain adjustment is performed based on a static gain or a dynamic         gain.     -   EEE15. The method of EEE13, further comprising:     -   receiving mixing information relating to at least one of static         gain(s) or dynamic gain(s).     -   EEE16. The method of EEE13, wherein     -   gain adjustment is performed for loudness adjustment.     -   EEE17. The method of EEE11, wherein     -   performing signal processing on the side-data stream includes         performing time-alignment.     -   EEE18. The method of EEE17, wherein     -   performing time-alignment is performed for time-aligning the         auxiliary audio information of the side-data bitstream with the         main audio information of the main bitstream.     -   EEE19. The method according of EEE17 or EEE18, further         comprising:     -   receiving time-alignment information regarding time-alignment of         the auxiliary audio information of the side-data bitstream with         the main audio information of the main bitstream.     -   EEE20. The method of EEE1, wherein     -   the packet type is defined to carry time offset signaling, in         particular for time-alignment.     -   EEE21. The method EEE1, further comprising:     -   receiving an indication of a timing offset of the side-data         stream to the main stream.     -   EEE22. The method EEE11, wherein     -   performing signal processing on the side-data stream includes         object rendering when the auxiliary audio information is         associated with positional information.     -   EEE23. The method EEE 22, wherein     -   object rendering is performed by an object renderer performing         object rendering for the main and side-data streams.     -   EEE24. The method of EEE11, wherein     -   performing signal processing on the side-data stream includes         format conversion.     -   EEE25. The method of EEE1, further comprising:     -   decoding the main stream by a standardized MPEG-H 3D audio         decoder.     -   EEE26. The method of EEE25, further comprising:     -   mixing media data contained in packets of the side-data stream         with media data generated by the standardized MPEG-H 3D audio         decoder.     -   EEE27. The method of EEE26, wherein     -   the media data contained in packets of the side-data stream is         uncompressed data, in particular PCM data, or compressed data,         in particular MPEG4 audio data.     -   EEE28. The method of EEE26, wherein     -   media data contained in packets of the side-data stream is         decoded by a decoder not standardized in MPEG-H 3D audio.     -   EEE29. The method of EEE1, wherein     -   the merged packetized media bitstream includes MHAS packets.     -   EEE30. A method for audio signal processing, comprising:         -   receiving a main stream indicative of main audio             information;         -   generating, based on auxiliary audio information, or             receiving the side-data stream indicative of the auxiliary             audio information, and         -   merging the main stream and the side-data stream to generate             a merged packetized media bitstream which includes packets             associated with a main stream indicative of main audio             information and packets associated with an side-data stream             indicative of auxiliary audio information.     -   EEE31. The method of EEE30, further comprising     -   packetizing media data indicative of the auxiliary audio         information into packets of the format of the merged packetized         media bitstream.     -   EEE32. The method of EEE30, wherein     -   the side-data stream relates to compressed auxiliary audio         information.     -   EEE33. The method of EEE32, wherein     -   the compressed auxiliary audio information includes MPEG-4 audio         data.     -   EEE34. The method of EEE30, wherein     -   the side-data stream relates to uncompressed auxiliary audio         information.     -   EEE35. The method of EEE34, wherein     -   the uncompressed auxiliary audio information includes PCM data.     -   EEE36. The method of EEE30, wherein     -   header information of packets of the merged packetized media         bitstream is indicative of a packet type.     -   EEE37. The method of EEE36, wherein     -   a value of the packet type of packets associated with the         side-data stream indicative of auxiliary audio information is         indicative of media data associated with the auxiliary audio         information.     -   EEE38. The method of EEE30, wherein     -   the merged packetized media bitstream includes MHAS packets.     -   EEE39. An apparatus for audio signal processing, comprising:     -   a receiver configured to receive a merged packetized media         bitstream which includes packets associated with a main stream         indicative of main audio information and packets associated with         an side-data stream indicative of auxiliary audio information,         and     -   a splitter configured to split the merged packetized media         bitstream, based on an identification of a value of a packet         type in header information of packets of the merged packetized         media bitstream, into the main stream indicative of main audio         information and the side-data stream indicative of auxiliary         audio information.     -   EEE40. Apparatus of EEE39, further comprising:     -   a mixer configured to mix an audio output signal based on an         output signal obtained from the main audio information of the         main stream and the output signal obtained from the auxiliary         audio information of the side-data stream.     -   EEE41. Apparatus of EEE39, further comprising:     -   a primary decoder configured to decode the main stream.     -   EEE42. Apparatus of EEE39, further comprising:     -   a secondary decoder configured to decode, when the side-data         stream relates to compressed auxiliary audio information, the         side-data stream.     -   EEE43. Apparatus of EEE39, further comprising:     -   a converter configured to convert, when the side-data stream         relates to compressed auxiliary audio information, media data         included in packets of the side-data stream.     -   EEE44. Apparatus of EEE42 or EEE43, wherein     -   the compressed auxiliary audio information includes MPEG-4 audio         data.     -   EEE45.Apparatus of EEE39, wherein     -   the side-data stream relates to uncompressed auxiliary audio         information.     -   EEE46. Apparatus of EEE45, wherein     -   the uncompressed auxiliary audio information includes PCM data.     -   EEE47. Apparatus of EEE39, wherein     -   the packet type indicates an internal raw format, in particular         a decoder-internal raw format.     -   EEE48. Apparatus of EEE39, further comprising:     -   a gain adjustment unit configured to perform gain adjustment         applied to the side-data stream.     -   EEE49. Apparatus of EEE39, further comprising:     -   a time-alignment unit configured to perform time-alignment         applied to the side-data stream.     -   EEE50. Apparatus of EEE39, further comprising:     -   an object renderer configured to perform object rendering         applied to the side-data stream.     -   EEE51. Apparatus of EEE50, wherein     -   the object renderer is included in a primary decoder.     -   EEE52. Apparatus of EEE39, further comprising:     -   a format conversion unit configured to perform format conversion         applied to the side-data stream.     -   EEE53. Apparatus of EEE39, further comprising:     -   a standardized MPEG-H 3D audio decoder for decoding the main         stream.     -   EEE54. Apparatus of EEE39, wherein     -   the merged packetized media bitstream includes MHAS packets.     -   EEE55. An apparatus for audio signal processing, comprising:     -   a receiver configured to receive a main stream indicative of         main audio information;     -   a local engine configured to generate, based on auxiliary audio         information, an side-data stream indicative of the auxiliary         audio information and/or a receiver configured to receive the         side-data stream, and     -   a merger configured to merge the main stream and the side-data         stream to generate a merged packetized media bitstream which         includes packets associated with a main stream indicative of         main audio information and packets associated with an side-data         stream indicative of auxiliary audio information.     -   EEE56. Apparatus of EEE55, further comprising:     -   a packetizer configured to packetize media data indicative of         the auxiliary audio information into packets of the format of         the merged packetized media bitstream.     -   EEE57. A system including an apparatus of EEE55 and an apparatus         of EEE39. 

The invention claimed is:
 1. A method for processing a merged packetized media bitstream, the method comprising: extracting, from the merged packetized media bitstream, a main stream that comprises MPEG-H 3D audio data encapsulated in an MHAS format; extracting, from the merged packetized media bitstream, an auxiliary stream that comprises additional audio data encapsulated as packets in the MHAS format, wherein the packets have a new MHAS packet type, wherein a format of a packet payload of the packets is different from a MPEG-H 3D format of the MPEG-H 3D audio data, and wherein the new MHAS packet type indicates an internal raw format; identifying time offset signaling that indicates there is a timeoffset of the auxiliary stream to the main stream, wherein the time offset signaling indicates that auxiliary stream signals shall be offset to arrive at a mixer aligned with the main stream; and time-aligning the additional audio data with the MPEG-H 3D audio data based on the time offset signaling.
 2. The method of claim 1, further comprising decoding the main stream based on the MPEG-H 3D format.
 3. The method of claim 1, wherein the packets include a sub-header identifying the format of the packet payload.
 4. The method of claim 1, further comprising decoding the auxiliary stream based on the format of the packet payload of the packets.
 5. The method of claim 1, further comprising outputting at least an output signal obtained from the main stream and the auxiliary stream.
 6. The method of claim 1, wherein the MHAS format is compatible to ISO/IEC 23008-3 standard.
 7. A non-transitory, computer readable storage medium having stored thereon instructions, that when executed by one or more processors, cause the one or more processors to perform the method of claim
 1. 8. An audio decoding apparatus for processing a merged packetized media bitstream, the apparatus comprising: a splitter configured to extract, from the merged packetized media bitstream, a main stream, wherein the main stream comprises MPEG-H 3D audio data encapsulated in an MHAS format, and an auxiliary stream, wherein the auxiliary stream comprises additional audio data encapsulated as packets in the MHAS format, wherein the packets have a new MHAS packet type, wherein a format of a packet payload of the packets is different from an MPEG-H 3D format of the MPEG-H 3D audio data, and wherein the new MHAS packet type indicates an internal raw format; an identifying unit configured to identify time offset signaling that indicates there is a timeoffset of the auxiliary stream to the main stream, wherein the time offset signaling indicates that auxiliary stream signals shall be offset to arrive at a mixer aligned with the main stream; and a time-alignment unit for time-aligning the additional audio data with the MPEG-H 3D audio data based on the time offset signaling.
 9. The apparatus of claim 8, further comprising an audio decoder for decoding the main stream based on the MPEG-H 3D format.
 10. The apparatus of claim 8, wherein the packets include a sub-header identifying the format of the packet payload.
 11. The apparatus of claim 8, further comprising an audio decoder for decoding the auxiliary stream based on the format of the packet payload of the packets.
 12. The apparatus of claim 8, wherein the apparatus further comprises an output unit for outputting at least an output signal obtained from the main stream and the auxiliary stream.
 13. The apparatus of claim 8, wherein the MHAS format is compatible to ISO/IEC 23008-3 standard. 